Steam Generator Sizing Guide

Step 1. Measure then multiply

Measure then multiply the Length x Width x Height (in feet) of the steam enclosure to determine the Cubic Footage.

Step 2. Determine Total Room Volume

You will need to adjust the cubic footage to determine the Total Room Volume.

  • For natural stone or marble, multiply by 2.0.
  • For ceramic or porcelain tile, or glass block, multiply by 1.35.
  • If using another material, consult the manufacturer for their recommendation in a steam shower application.

Exterior Wall: For one, multiply by 1.1; for two, multiply by 1.2.

Ceiling height: For a 9 ft. ceiling, multiply by 1.15; for a 10 ft. ceiling, multiply by 1.3.

Step 3. Select the Right Size Generator

You will need to select a Steam Generator equal to or greater than your Adjusted Cubic Footage.

Generators for Adjusted Cubic Foot Range:
  • 7.5kW Generator = 101 - 250 adj. cubic ft.
  • 10kW Generator = 251 - 450 adj. cubic ft.
  • 12kW Generator = 451 - 550 adj. cubic ft.
  • 15kW Generator = 551 - 675 adj. cubic ft.

Note: If there is a skylight or outside window, select the next largest generator. Skylight or window must be double-pane and sealed from the inside the steam shower. Generator voltage must match existing local utilities (208 or 240 Voltage). For optimum performance, ceiling height should not exceed 8 feet (10 feet max).

Sample Math

The example is based on a 5 ft. x 6 ft. x 8 ft. high room with marble walls and one exterior wall.

Cubic Footage: 5′ x 6′ x 8′ = 240
Material Adjustment: 240 x 2.0 = 480
Exterior Wall Adjustment: 480 x 1.2 = 528
Ceiling Adjustment: 0
Adjusted Cubic Footage: = 528

In this example, you would select the 12kw generator.